Low-Energy Collision Cross Sections of H— and OH— Ions in Oxygen

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Abstract
Elastic and inelastic collision cross sections have been measured for collisions of H— and OH— ions in oxygen gas in the energy range 4–350 eV. An improved collision chamber was used for the measurements. The majority of the inelastic collisions in the case of OH— are apparently due to electron detachment, but in the case of H—, charge exchange or an ion—molecule reaction or both predominate, particularly at the low energies. In the range 4–26 eV the interaction potential derived from the elastic scattering of OH— in O2 is V (eV) = —18.4/r5.34(r in Å). The large amount of inelastic scattering observed for H— in O2 precluded an accurate determination of the interaction potential in this case. The electrons produced in electron‐detachment collisions of negative ions are shown to have energies considerably in excess of thermal energy.

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